Patents by Inventor Takuya Shimomugi

Takuya Shimomugi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190097563
    Abstract: A motor drive apparatus which drives a motor includes inverter modules equal in number to phases of the motor. Each of the inverter modules includes a plurality of switching element pairs. Each of the switching element pairs is defined by two switching elements connected in series. In each of the inverter modules, the plurality of switching element pairs are connected in parallel, and each of resistance values of gate resistors connected to the switching elements is set for the corresponding switching element connected thereto.
    Type: Application
    Filed: September 4, 2015
    Publication date: March 28, 2019
    Inventors: Takuya SHIMOMUGI, Yosuke SHINOMOTO, Katsuhiko SAITO, Norikazu ITO
  • Patent number: 10128775
    Abstract: A motor drive apparatus driving a motor as a three-phase motor converting direct current into three-phase alternating current, includes: inverter modules and equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: November 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Yosuke Shinomoto, Koichi Arisawa, Kazunori Hatakeyama
  • Patent number: 10116205
    Abstract: Provided is a power conversion device configured to convert electric power from a power source to a load, including: a boosting device including a boost rectification unit configured to prevent backflow of a current from the load side to the power source side, the boosting device being configured to change a voltage of power from the power source to a predetermined voltage based on a drive signal; a commutation device configured to perform commutation operation in which a current flowing through the boosting device is caused to flow into an other path based on a commutation signal; and a signal generating module device configured as a module to generate and send an output signal based on an input signal that is input thereto. The input signal has an on-pulse width greater than a length of time where the output signal generated by the signal generating module device is turned on.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: October 30, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Takuya Shimomugi, Takashi Yamakawa, Keisuke Uemura, Noriyuki Matsubara, Shinsaku Kusube, Kenta Yuasa, Akihiro Tsumura
  • Publication number: 20180198390
    Abstract: An electric motor includes a stator, a rotor provided to be rotatable with respect to the stator, and a driving circuit board including a power IC applying a driving voltage to the stator, a Hall IC detecting a rotation position of the rotor, and a control IC adjusting a phase of the driving voltage in accordance with a magnetic-pole-position signal from the Hall IC and rotation speed information calculated on the basis of the magnetic-pole-position signal. The Hall IC is provided at a position at which an advance angle is larger than zero when a rotation speed of the rotor is zero.
    Type: Application
    Filed: October 30, 2015
    Publication date: July 12, 2018
    Inventors: Junichiro OYA, Tomoaki OIKAWA, Mineo YAMAMOTO, Hiroyuki ISHII, Hiroki ASO, Yuto URABE, Kazunori HATAKEYAMA, Takuya SHIMOMUGI
  • Patent number: 10003184
    Abstract: A backflow preventing device includes a backflow preventing element connected between a power source and a load, for preventing a backflow of a current from the load side to the power source side, a commutation device configured to perform a commutation operation of causing a current to flow through an other path connected in parallel to the backflow preventing element, and a controller configured to change a pulse width of a commutation drive signal for controlling the commutation device to perform the commutation operation based on a current flowing through the backflow preventing element, and transmitting the commutation drive signal having the changed pulse width to the commutation device. The controller transmits the pulse to the commutation device only for a necessary time period so that the commutation device performs the commutation operation, to thereby reduce electric power relating to the commutation operation not contributing to the power conversion.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: June 19, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Koichi Arisawa, Takashi Yamakawa, Keisuke Uemura, Shinsaku Kusube, Kenta Yuasa, Akihiro Tsumura
  • Patent number: 9991817
    Abstract: A power converting device includes: a rectifying circuit connected to an alternating-current power supply for converting alternating-current power from the alternating-current power supply into direct-current power; a short-circuit unit constituted by a diode bridge and a short-circuit element connected to opposite output ends of the diode bridge for short-circuiting the alternating-current power supply via a reactor; and a control unit that generates plural drive signals to control the short-circuit unit during a half cycle of the alternating-current power supply. The control unit generates a sine-wave-shaped current control range that is a target control range of power supply current of the alternating-current power supply, and maintains values of the power supply current of the alternating-current power supply within the current control range.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: June 5, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Koichi Arisawa, Takashi Yamakawa, Yuji Takayama
  • Patent number: 9960702
    Abstract: A switch device in a power conversion device is located between a power supply and a load, wherein the power conversion device includes a shunt resistance and a switching element and is capable of executing stable control, the switch device includes a switching element that includes a gate terminal, a gate drive circuit that applies a drive voltage Vcc to a gate terminal of the switching element, and a control unit that generates a drive signal to the gate drive circuit, wherein a value obtained by subtracting a threshold voltage Vth of the switching element from the drive voltage Vcc to be applied to the gate terminal of the switching element is greater than a product of a resistance value Rsh+Rdc from an emitter of the switching element to a negative electrode of the gate drive circuit and a maximum current value Ipeak that flows through the switching element.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: May 1, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
  • Patent number: 9941810
    Abstract: A power conversion device includes a rectifier circuit that converts an AC power from an AC power supply, into a DC power, a short-circuit unit that short-circuits the AC power supply via a reactor connected between the AC power supply and the rectifier circuit, a control unit that generates a plurality of drive signals to control the short-circuit unit in a half cycle of the AC power supply, and a smoothing capacitor. The control unit stepwise varies threshold values that limit a value of a power-supply current of the AC power supply, in an on-section or an off-section of the plurality of drive signals.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: April 10, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Takashi Yamakawa, Yuji Takayama, Takuya Shimomugi, Yosuke Shinomoto
  • Patent number: 9929670
    Abstract: A power conversion device is configured to have reactors and is configured to have chopper circuit units, connected in series, that chop the output of a rectifier configured to rectify an AC voltage from an AC power supply. The power conversion device includes: an AC switch disposed on a side closer to the AC power supply than the chopper circuit units; an AC reactor that is connected in parallel to the AC switch; and a switching control unit that stops the switching of the switching elements when the contact of the AC switch is open.
    Type: Grant
    Filed: May 26, 2014
    Date of Patent: March 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Michio Yamada, Takuya Shimomugi, Yosuke Shinomoto, Mitsuo Kashima, Shigeo Umehara
  • Patent number: 9847735
    Abstract: A power conversion device includes a switching control unit that controls respective switching elements constituting a plurality of chopper circuits, a rectified-voltage detection unit, a bus-bar voltage detection unit, and a bus-bar current detection unit. The switching control unit includes an on-duty calculation unit that calculates a reference on-duty of respective drive pulses with respect to the switching elements based on a bus-bar voltage and a bus-bar current, an on-duty correction unit that corrects the reference on-duty to output on-duties of the respective drive pulses based on the bus-bar current, so that change amounts of respective reactor currents become substantially the same, and a drive-pulse generation unit that generates the respective drive pulses, based on the respective on-duties.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: December 19, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Michio Yamada, Yosuke Shinomoto, Mitsuo Kashima, Shigeo Umehara
  • Patent number: 9829226
    Abstract: An object of the present invention is to maintain a heating amount constant when a compressor is heated at the time of shutdown of the compressor, regardless of the influences of production tolerance and environment variations. An inverter control unit causes an inverter to generate a high-frequency AC voltage having a de-energized section in which a voltage applied from the inverter to a motor is zero between a section in which the voltage is positive and a section in which the voltage is negative. At this time, the inverter control unit detects a value of a current flowing to the inverter in a detection section residing from immediately before a start of the de-energized section to immediately after an end of the de-energized section, and causes the inverter to generate a high-frequency AC voltage adjusted according to the detected current value.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: November 28, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Hatakeyama, Takuya Shimomugi, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Patent number: 9806594
    Abstract: A drive device driving a power converter that includes a switching element formed from a wide bandgap semiconductor, includes a PWM-signal output unit that generates a drive signal that drives the switching element with PWM; an on-speed reducing unit that, when the switching element is changed from off to on, reduces a change rate of the drive signal; and an off-speed improving unit that, when the switching element is changed from on to off, draws charge from the switching element at a high speed and with a charge drawing performance higher than that at a time when the switching element is changed from off to on.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: October 31, 2017
    Assignee: MITSUBISHI CORPORATION
    Inventors: Yosuke Shinomoto, Michio Yamada, Kazunori Hatakeyama, Takuya Shimomugi
  • Publication number: 20170288595
    Abstract: A motor drive apparatus driving a motor as a three-phase motor converting direct power into three-phase alternating power, includes: inverter modules equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.
    Type: Application
    Filed: November 4, 2014
    Publication date: October 5, 2017
    Inventors: Yosuke SHINOMOTO, Takuya SHIMOMUGI, Norikazu ITO, Keisuke UEMURA, Takashi YAMAKAWA
  • Patent number: 9780717
    Abstract: A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: October 3, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
  • Publication number: 20170279377
    Abstract: A motor drive apparatus driving a motor as a three-phase motor converting direct current into three-phase alternating current, includes: inverter modules and equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.
    Type: Application
    Filed: November 4, 2014
    Publication date: September 28, 2017
    Inventors: Takuya SHIMOMUGI, Yosuke SHINOMOTO, Koichi ARISAWA, Kazunori HATAKEYAMA
  • Publication number: 20170241691
    Abstract: A heat pump apparatus includes a compressor compressing a refrigerant, a motor driving the compressor, an inverter device, and an inverter control unit controlling the inverter device. The inverter device includes the same number of bridge circuits as those of phases of the motor, and each of the bridge circuits includes plural pairs of series-connected switching elements. The pairs of switching elements are connected in parallel. The inverter device applies to the motor a high-frequency voltage of a frequency at which the motor does not rotate.
    Type: Application
    Filed: November 4, 2014
    Publication date: August 24, 2017
    Inventors: Takashi YAMAKAWA, Kazunori HATAKEYAMA, Takuya SHIMOMUGI, Yosuke SHINOMOTO
  • Patent number: 9742267
    Abstract: A power converter for converting electrical power from a power source to a load, including: a boosting device including a boost rectifier configured to prevent a backflow of a current from the load to the power source, the boosting device being configured to change a voltage of electrical power from the power source to a predetermined voltage; and a commutation device including: a commutation operation device configured to perform a commutation operation of directing a current flowing through the boosting device to an other path; and a commutation rectifier including a plurality of rectifiers and connected in series on the other path, the commutation rectifier being configured to rectify a current relating to commutation, thereby reducing a capacitance component.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Takuya Shimomugi, Takashi Yamakawa, Keisuke Uemura, Yosuke Shinomoto, Kenta Yuasa, Akihiro Tsumura, Noriyuki Matsubara, Shinsaku Kusube
  • Patent number: 9735666
    Abstract: A power conversion device located between an AC power source and a load includes: a rectifier circuit unit that rectifies a voltage of the AC power source; a smoothing unit that smooths a DC voltage on the load side of the rectifier circuit unit; a short-circuiting unit that short-circuits the AC power source; a step-up reactor—located on the AC power source side of the short-circuiting unit; at least one of a reactor current detecting unit—that detects the current of the step-up reactor and a bus voltage detecting unit that detects an output voltage of the smoothing unit; a counterflow preventing element that prevents a counterflow of the current from the smoothing unit to the AC power source; a switching control unit that outputs a control signal for the short-circuiting unit; and a switching frequency changing unit that changes a frequency of the control signal using a logic operation.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: August 15, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Kenta Yuasa, Yosuke Shinomoto, Shinsaku Kusube
  • Publication number: 20170207718
    Abstract: A power converting device includes: a rectifying circuit connected to an alternating-current power supply for converting alternating-current power from the alternating-current power supply into direct-current power; a short-circuit unit constituted by a diode bridge and a short-circuit element connected to opposite output ends of the diode bridge for short-circuiting the alternating-current power supply via a reactor; and a control unit that generates plural drive signals to control the short-circuit unit during a half cycle of the alternating-current power supply. The control unit generates a sine-wave-shaped current control range that is a target control range of power supply current of the alternating-current power supply, and maintains values of the power supply current of the alternating-current power supply within the current control range.
    Type: Application
    Filed: August 5, 2014
    Publication date: July 20, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya SHIMOMUGI, Koichi ARISAWA, Takashi YAMAKAWA, Yuji TAKAYAMA
  • Patent number: 9692312
    Abstract: A power conversion apparatus includes a rectifier, a converter including a reactor, a switching element, and a reverse current prevention element, a smoothing capacitor configured to smooth the output voltage, a current detector configured to detect a reactor current, a voltage detector configured to detect the output voltage, and a converter control unit configured to control operation of the switching element of the converter. The converter-control unit includes a switching command calculation unit configured to calculate a switching command value responsive to a ratio of the rectified voltage to the output voltage in accordance with the output voltage and the reactor current, a switching control unit configured to control operation of the switching element in accordance with the switching command value, and a supply abnormality determination unit configured to determine occurrence of a momentary power failure or voltage sag in accordance with the switching command value.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: June 27, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenta Yuasa, Shinsaku Kusube, Akihiro Tsumura, Takuya Shimomugi